Adjustable gauge



Oct. 14' 1924,-

J. ABATH ADQTUSTABLE GAUGE Filed Jan;- -15 1920 mm D @n w om tionPatented Oct. 14, 1924.

- UNITED STATES 1,511,934 PATENT OFFICE- JOHN BATH, OF WORCESTER,MASSACHUSETTS, ASSIGNOR TO JOHN BATH & C0., INC.,O'F XVORCESTER,MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS.

. AnJusTABLE. GAUGE.

Application led January 15, 1920. Serial 11o-351586.

Be it known that I, JOHN BATH, a citizen of the United States, residingat Worcester 4in the county of Worcester and State of lfassachusettts,have invented a new and useful Adjustable Gauge, of which.v thefollowing is a specification. j

This vinvention relates to an adjustable 4g'gaugeparticularly designedfor measuring and comparing internal diameters.

It is the generalobject of my invention to provide an adjustable' gaugeby which vinternal measurements 'maybe made with great accuracy. A'.further objectof my invention is to provide a gauge by which variationsin diameter from a t-rue circle may be readily indicated. Y v I alsoyprovide means for locking the gauge `in any adjusted position and forchanging the gauge at will from afreely adjustable vgauge to a"go andno-go gauge having fixed limits of minimum `and maximum diameters.Another important object of my invention is to provide an adjustableinternal gauge having provision for micrometer readings on a finescale', in combination with means for adjusting the indicating mechanism to compensate for wear' or re-dressing of the gauge bars. v

A preferredL form of j my invention is shown in the drawings,in whichFig. 1 is a side elevation of my improved gauge;

Flg. 2 is a longitudlnah'sectlonal eleva- Fig. 3 is a partial `end view;Figs. 4 and 5 are perspective views of detail parts to be described, and

Fig. 6 is a sectional view taken'along the `linee-6in Fig. 2.

Referring tothe drawings, my improved i gauge comprises a supportingsleeve or casing 10, in which a threaded operating shaft is rotatablymounted. f An actuating' member or collar 12 is threadedon one end ofthe shaft 11 and is provided with a pluralitywof inclined dove-tailedguide ways 13, in which wedge-shaped, dove-tailed conrtact membersor'gaugebars 14 vare slidably mounted. The guide ways 13 and bars 14 iare very carefully finished andthe bars have` Va very close and accuratesliding fit'in the guide ways.

At their right hand ends, as viewed inthe drawings, the barsy 14 abutagainst a flange 15011 one endofthe-casingf 10. Onefof the bars, 14a, ispro-vided with a radialslot 16, (Fig. 2) intoiwhich' projects` akey117fixed in the fiange'l. This key andjivslot4 connection permits the'bar'14L to move rae` dially, b nt absolutelypreventsl angular movementof the bars orof the collar 12 relative tothe casing-10. The-'collar12has a reduced cylindrical extension 18 Yprojecting into a recess 19inthe end ofthecasing 10,

by whichl construction',`rthe l thread onf/thea;

-shaft Y11 is' entirelyV covered'and protected 1n every position ofthe'collar 12. The shaft j 11 is providedwith a shoulder-20 engagingyone side of a hardened steel collarv21 which,

in turn, engages an internalj shoulderf22yj.,

of the casing 10, thus limiting' movement lof the shaft 11 to the left.j f

A disc or flange23 engages the left-hand ends of the gauge bars.14and ispro-vided with a cylindrical projection y24 havingan internal flange 25at the right handend thereof; The disc 23 ispreferably'of4 hardenedsteel and its f1ange` 25 isengaged'by a hardened steel collar r26.-loose on av re-` ducedthre'aded portion 27 ofthe shaft 11.-

'The disc 23fhas a pin ,and-slot; connection.

with the gauge "bar 14a similar to the connection between-the gauge barandthe fi'ange 15, by which construction, .thel disc 123` is held fromrotation.

'A recessed lnut 28 isv mounted on the l* y threaded 'portion 27V as isalsoa lock-nut 29. The-nuts 28 and l29are.provided with suitable slotsin their4 outer 'faces and may be adjusted `byy means of Vspecial*`screwl drivers. f.

' Thefcollar 26 maybe moved bylmeans of 'the lnuts 28 Aandp29 tocloselyengage the fiange 25 while, at the same time, the 'shoulf` derv20 of the shaft 11-forcesthe washer or, collar 21 against the shoulder22of the cas'- ing 10. Axial movement' of the shaft 11 relative to thecasing 10 is thus prevented and all lost motion avoided. yThe,cylindrical yprojection 24v-covers and'protects thevouter Y end'of thethreaded portion of the/shaft 11 in every position of the collar 12. j vv When' itis ydesired to prevent `unauthorized adjustmenti of the-gauge,'the recess lin the disc '23 surrounding kthe nuts 28 and 29 maybe Vsealed with v'wa-X. ori-other suitable material. Aplate BOmay thenbe secured inn the end--`oftherecess by al screw 31 threaded inthe shaft1 1. at the inner end of vindot'ted lines in Fig. 2,' preserves theadjustment of the collar 82.

Fior locking the' gauge to hold a desired adinet-ment, I provide'atransverse open ing 3 5 inr the shaft 11, Within which clan1pblocks orplugs 36 are mounted for axial rnevement,'theirV outer ends engaging aninner surface of the casing 10. The plugs Biware provided' with taperedV-shaped notches at their inner ends and are engaged byy the taperedinner end of a. clamping screw 37 threaded in an axial opening in theshaft 11, As the screw 37 is turned ,'inward, the blocks Vort plugs 36are forced outyvard and prevent relative angular movenient of the shaftandcasing. compression spring 38 is positioned inthe inner `end of therecess in the shaft l1 and forces a Cap 89 against the inner end of thescrew 37. The spring 38 assists in preventing undesired rotation of thescrewl when released from binding position.

I also utilize Ythe recess in the shaft 1l as an yoil reservoir,connecting the same by the oil passages 40, 41, 42,43 and 44 to,di'erent parts of the gauge so that oil may be distributed to the"severalv working sur- Jfaces thereof.

The mechanism thus far described prol yides a gauge which may beaccurately adjusted and Which may beset and held at any desireddiameter-` I will new describe the-construction by which the actualdiameter of the gaugel is indicated.

One of the gauge bars 14 is provided with an index mark on its side asshown in Fig. 1, which mark cooperates withY a graduated indei plate 45mounted foraxial adjustment Qn the cylindrical surface of the actuatingmember 12. The plate 45 is preferably provided with@ short fiange 46slidable in a groove 47 in the member 12, by which it is guided and heldfrom angular displacement. This plate and indezg cooperate to show thediameter of the gauge, each space on the index plate illustratedrepresenting an increase or decrease'of five one-thousandths of an inchin diameter. For sub-dividing this graduation to fractions ofthousandths, l provide a zero mark at the right hand end ofthe casing l0cooperating with a` graduated collar 50 rotatably mounted on the reducedright hand end of the shaft 11. The

right hand face of the `collar 5() is provided Wax to prevent tamperingWith the gauge and the opening is then ,closed by a seeond screw 53%.

When the gauge is set t@ all @Keet .Steedard size, determined' bycomparison with any known standard, the collar 5.() rotated to bring'thezero thereon in linel with the'index mark on the casing, and the coilaris then placed in position and secured to the shaft 1l by the screw rEhecellar 50 thereafter rotates with the shaft 11 indicates the changes indiameter ef `the gauge in tenethousandths of an ineh. lf at imi time thesans@ bers bia-seme were @ad require rei-dressing, the gauge. be aga-nset to standard size and the collar 5()- may be again adjusted to. zeroby temeraria removing the collar 5.2

It is sometimes desirable to provide a `gauge which may be adjustedQn'ly between fixed limits, such a gauge being cginrnonlyi known as a goand nofgo gauge, lthe terni indicating that the gauge will enter a heleof the reguired site when at 4its limit and will not enterthe hele whenat the maximum limit. These limits cglmmonly differ only by amountsexpressed le trastions of thousandths. l

T0 adapt my impreved sans@ t0 auch use I provide a flange 55 45,` en.'the graduated collar 51) said iiange haying a lug 56 projectingtherefrom. I also provide a segmental rime .57 (Fisf adapted; te bepositioned between the end of the flange, l5,5

`and a shoulder .5.3. 011 the .Shaft 1.1-

The ring 57 is provided With a series of holes 59, into any one of whicha locking stud or screw 60 may b e inserted Wien thus secured, themovement of the shaft 11 in both directions is limited by engagement ofthe lug 5d with the ends Vthe seg-l mental fine' 5.7- The (iranes in theii'ng 57 may be made Qt any desiree leegte-t0 @meer-@11d te the limits,required: arid the ries may be adjusted by inertie" the Screw 60 indifferent holes 59 to give tlixe required values for the upper and lowerreadings.

When it is desir-@fl t@ use the sans@ .as a Simple adjustable sauge itiS Simply 'lie- @SSa-ry t0. remove the screw .6.0, thus permitting thering to rotate freelyV the collar 50. I provide. a threaded hole 6linthe end 0f th@ lOkllg. SGFGW 3l 3.1.1@ 211,50 provide a short screw 62corresponding-in diameter to the screw QQ. then the screw 60 iS removed,it ,iS desiell@ Ils-Plast the same `by the screw 62, thus preventingtheentranceof .dirt into the. casing l0. The

screw 60 .may be similarly inserted in the opening llto prevent loss ofsaid screw.

Having thus described my improved gauge `and the uses and operationthereof,

it-'Will'lbe evident that changes and modifications can be made thereinby those skilled in the art Within the spirit and scope of my inventionas set forth in the claims and I do not Wish to be otherwise limitedv tothe details herein disclosed, but what 'I claim f-f isil I l.Anadjustable gauge comprising a casing', a threaded shafttrotatabletherein, an actuatingy memberthreaded on said shaft and' longitudinallymovable thereby, a pluff iiality of` ,gauge bars movable radially bysaid member, .said member and gauge bars' having engaging surfacesdisposed at -a relatively slight inclinationt-o the aXis of said.

shaft, and mea-ns toi hold-said shaft lin adjusted angular 'position insaid casing, said means comprising a pair of radially movable 'blockshaving notched inner ends, and

a longitudinally` yinoivable clamping screw havingaconical-end engagingthe notched inner yends of said blocks, to force the saine 'outwardsagainst the inner surface of said.

atively slight inclination to the axis of said shaft,-'and-means toindicate the angular position of said shaft relative tosaid casing, saidImeans comprising a graduated collar angularlyy adjustable relative tosaid shaft, a -second collar fixed-tosaid shaft, Vand lmeans to holdsaidcollars in different angular relations to each other.

An adjustable gauge comprising casing, threadedshaft rotatable therein,an actuating memberl threaded on said shaft and longitudinally movablethereby, a plurality of gauge bars movable radially by said member, saidmember and gauge bars having engaging surfaces disposed at a relativelyslight inclination to the aXis of said shaft, and means to indicate theangular position of said shaft relative to said casing, said meanscomprising a graduated collar having a plurality of radi-ally disposednotches in one end face, a second collar having cooperating notches inits adjacent face, and means to secure said second collar in iiXedposition on said shaft.

4. An adjustable gauge comprising a casing, a threaded shaft rotatabletherein, an j actuating member threaded on said shaft and longitudinallymovable thereby, a. plurality of gauge bars movable radially by saidmember, said member and vgauge bars having engaging surfaces .disposedat a rel atively slight inclination to the axis of said shaft, andmeanspermitting only limited angular movement of less than one revolution ofsaid shaft relative to said casing.

5. An adjustable gauge comprising a cas! ing, a threaded shaft rotatabletherein, an actuating member threaded on said shaft and longitudinallymovable thereby, .a plurality of gauge bars movable vradially by saidmember, said member and gauge bars having engaging surfaces disposed atla relatively slight inclination to the axis of said shaft, and means.permitting only jlim-ite'd angular movement of said shaft relative tosaid casing, said means comprising a segmental' ring fixed to one of'said parts and a member secured' to the other lpart having yaprojection positioned to; engage the/ endsof said ring as stop-s whensaid shaft ismoved angularly.v y, y 6. An [adjustable gauge comprisingacaslng: actuating member threaded on said shaft and longitudinally'movable thereby, `a plurality of ygauge barsjmovable radially. by vsaidmember, said member andfgauge bars a threaded shaft rotatable therein,an

having engaging surfaicesdisposed at a relatively slight inclination tothe axis of said shaft, and means to limit angular movement of saidshaft relativ'eto said casing, said means comprising a1 segmental ring,means to secure said ring to said casing .infany one of al plurality ofdifferent angularfpiositions,

a. member rotatable With' said shaft and havinga portion engaging saidvring, and

.means tosecure said member-to said shaft iii aA selected angularposition. A

,7. `rinadjustable gauge comprisingv a casi .ing, a. threaded shaftrotatable therein, an .actuating Imember threadedv konsaidmsha'fi'. andlongitudinally.movable thereby, a plu-l rality of gauge bars movableradially by said member, rsaid member and gaugebars having engagingsurfaces `disposed ata relativelyslight inclination toi the axis of saidshaft, means to limit angular movement olf said shaft relative to saideasing, and a device effective to render said means operative orinoperative at Will.

8. An adjustable gauge comprising a casing, a threaded shaft rotatabletherein, an actuating member threaded on said shaft` and longitudinallymovable thereby, and .a plurality of gauge bars movable radially by saidmember, said lmember and gauge bars having engaging surfaces disposedata rel'- atively slight inclination to the axis of said.

shaft, said shaft having an oil reservoir therein connected by suitablepassages V*to lubrieate the bearing surfaces of said gauge.

9. An adjustable gauge comprising a casing, a threaded shaft rotatabletherein, an actuating member threaded onv said shaft iso p.

vas

and longitudinally movable thereby, a plu rality of gauge bars movableradially by said member, saidmember and gauge bars having engagingsurfaces disposed at a relatively slight inclination to the axis of saidshaft, means to prevent angular movement of said gauge bars, a discengaging the outer ends of said bars and having an internally flangedprojection encircling said shaft, a bearing collar slidable on saidshaft, and engaging the ilange portion of said disc, and adjusting andlocking nuts for said collar.

10. An adjustable gauge comprising a casing, a threaded shaft rotatabletherein, an actuating member threaded on said shaft and longitudinallj,Tmovable thereby, a plurality of gange bars movable radially by saidmember, said member and gauge bars having engaging surfaces disposed ata relatively slight inclination to the axis of said shaft, means toprevent angular movement of said gauge bars, a disc engaging the outerends of said bars and having an internally flanged projection encirclingsaid shaft, a collar slidable on said shaft, and engaging the flangeportion of said disc, adjusting and lock nuts for said collar, and meansto cover and protect said lock nuts and the adjacent end of said shaft.

il. An adjustable gauge comprising a casing, a threaded shaft rotatabletherein`r an actuating Amember threaded on said shaft and longitudinallymovable thereby, a plurality of gauge bars movable radially by saidHlmber, said member and gauge bars having engaging surfaces disposed ata relative-ly slight inclination to the axis of said shaft, and means toindicate the diameter of said gauge, said means comprising a scalelongitudinally movable of said gauge and a (Jo-operating index mountedin i'ixed longitudinal position in said gauge to indicate largerdiameter divisions, and also a scale angularly movable relative to saidcasing and a co-operating index fixed relatively to said casing toindicate smaller diameter divisions.

l2. An adjustable gauge comprising a. casing, a threaded shaft rotatabletherein, an actuating member threaded on said shaft and longitudinallymovable thereby, a plu-V .ends of said bars and 'annternall ilangedprojection encircling saidshat, 'a bearing collar slidable on saidshaft,' and engaging the flange portion of said disc, and adjusting andlocking` nuts for said collar, said member being recessed at its outer`end, and said projection vextend-ingl into said recess and protectingthe outer? threaded por.- tion of said shaft in all positions of 'Saidmember.

13. An adjustable gauge comprising a cas ing, a threaded shaft rotatabletherein, an actuating member threaded Ion said1 sha-ft andlongitudinally movable thereby, said memberhaving a recess in its outerend, a plurality of gauge bars movable radially by said member; saidmember and rgauge bansv having engaging surfaces disposed at arelatively slight inclination to the axis of said shaft, means toprevent angular movement of said gauge bars relative to said casing, adisc engaging thefouterend of said bars and having an internally flangedprojection en-l circling said shaft, "a collar slidable on said shaft,and engaging the flange portion of said disc, adjusting'and lookI nutsfor said collar, and means to cover and 'protect said lock nuts and theadjacent end olf said shaft,

said collar, nuts and cover being diSPosed Within the cylindricalprojection ofsaid disc, and said"Y projection'eXtend-ing into the recessin the daterend of said memberin every position thereof.

In testimony whereof I have hereunto aliixed my signature.

JOHN BATH. v

